KB: You receive an error message when you try to send an e-mail message by using the System.Web.Mail namespace in the .NET Framework
We have an article published now which addresses my earlier post about the myths regarding SmtpServer.Insert...
922777 You receive an error message when you try to send an e-mail message by using the System.Web.Mail namespace in the .NET Framework 1.0
https://support.microsoft.com/default.aspx?scid=kb;EN-US;922777